Extended Distribution of Eria Spicata (Orchidaceae), a Curious Sympodial Orchid from the Indian Subcontinent A
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Extended distribution of Eria spicata (Orchidaceae), a curious sympodial orchid from the Indian subcontinent a Dinesh K. Agrawala 1 & Krishan Lal 2 Keywords/mots-clés : Pinalia, Himachal Pradesh, taxonomy/taxinomie, biogeography/biogéographie. Abstract Eria spicata (D.Don) H.R.E.Handel-Mazzetti, belonging to Section Pinalia , is reported for the first time from the state of Himachal Pradesh, India. The global distribution of the species is discussed. A detailed description coupled with illustration is provided to facilitate easy identification. An artificial key to the species belonging to Section Pinalia for India is also provided to show their relationship. Résumé Extension de la distribution géographique de Eria spicata (Orchidaceae), curieuse orchidée sympodiale du sous-continent indien – Eria spicata (D.Don) H.R.E.Handel-Mazzetti, de la section Pinalia , est pour la première fois enregistrée dans l'état de Himachal Pradesh, Inde. La distribution globale de l'espèce est discutée. Une description détaillée, associée à une illustration, en est donnée afin d'en faciliter l'identification. Une clé artificielle des espèces indiennes de la section est également proposée pour montrer leurs relations. a : manuscrit reçu le 9 novembre 2012, accepté le 23 novembre 2012. article mis en ligne sur www.richardiana.com le 26/11/2012 – pp. 80-91 - © Tropicalia ISSN 1626-3596 (imp.) - 2262-9017 (élect.) 80 Richardiana XIII – novembre 2012 Distribution of Eria spicata – Agrawala & Lal Introduction Eria J.Lindley is one of the large, polymorphous, sympodial, epidendroid genera of Orchidaceae, distributed mainly from tropical-Asia to the Indo- Pacific region. Considering the high amount of heterogeneity prevailing among its infrageneric taxa, the genus is divided into several sections. Section Pinalia J.Lindley is characterized by small flowers in dense or lax, cylindrical or globular heads; lip with side-lobes and keels; column-foot hollowed at its upper side, upward curved distally and firmly connected to the short claw at the base of lip, without a geniculate band or distinct joint. Within India, the section is represented by 7 species, distributed mostly in the Himalayan region and North-East India, with one species [ Eria meghasaniensis (S.Misra) S.Misra] extending south into peninsular India. Eria spicata (D.Don) H.R.E.Handel-Mazzetti, the most characteristic species of this section, is distributed widespread from the state Uttarakhand in the North-Western Himalaya, through Nepal, Bhutan, Eastern Himalaya, North-East India, China and Myanmar to Thailand [Seidenfaden (1982); Agrawala (2009)]. During a recent botanical tour to Himachal Pradesh, the species was found growing epiphytic on rock boulders at Neugalsari, Kinnaur district. The specimens were compared with earlier studied plants of the same species from other regions and found to be identical. Perusal of relevant literature [Collett (1902); Duthie (1906); Nair (1977); Vij et al . (1982); Seidenfaden & Arora (1982); Chowdhery & Wadhwa (1984); Deva & Naithani (1986); P.B. Singh et al . (1993, 1994); Ashwal & Mehrotra (1994); Chowdhery (1998); Dhaliwal & Sharma (1999); Singh & Rawat (2000); Pearce & Cribb (2002); Kaur & Sharma (2004); Singh & Sharma (2006); Lal & Rawat (2008); Pusalkar & Singh (2008)] revealed that this is the first report of its occurrence in this state. Thus the western limit of global distribution range of this species extends further from the state of Uttarakhand to the state of Himachal Pradesh. The detailed nomenclatural citation, synonymy, description coupled with illustration are provided here to facilitate easy identification. An artificial key to the species under Section Pinalia in India is also provided to show their relationships. XIII – novembre 2012 Richardiana 81 Distribution of Eria spicata – Agrawala & Lal Citation and Synonymy Eria spicata (D.Don) H.R.E.Handel-Mazzetti, Symbolae Sinicae 7: 1353 (1936); Pradhan, Indian Orchids 2: 365 (1979); Hara et al ., Enumeration of Flowering Plants of Nepal : 42 (1982); G.Seidenfaden in Opera Botanica 62: 126, f.78 (1982); S.K.Kataki, Orchids of Meghalaya : 92, pl.29(1a-1b) (1986); Deva & H.B.Naithani, Orchid Flora of North-West Himalaya : 287, f.163 (1986); R.C.Srivast in Hajra & D.M. Verma (eds.), Flora of Sikkim 1: 69 (1996); H.J.Chowdhery, The Orchid Flora of Arunachal Pradesh : 381, f.229 (1998); J.R.Press et al. , Annotated Checklist of Flowering Plants of Nepal : 216 (2000); T.M.Hynniewta et al. , Orchids of Nagaland : 181, f.60 (2000); N.Pearce & P.J.Cribb, The Orchids of Bhutan : 383, pl.19 (wrongly labeled as Eria stricta ) (2002); W.J.Kress et al. , Checklist of trees, shrubs, herbs and climbers of Myanmar : 78 (2003); C.Sathish Kumar & P.C.Suresh Kumar, Rheedea 15(1): 39 (2005); Lucksom, The Orchids of Sikkim and North-East Himalaya : 559, f.342, pl.24 (2007). Octomeria spicata D.Don, Prodromus Florae Nepalensis : 31 (1825). Eria convallarioides J.Lindley, Genera and Species of Orchidaceous Plants : 70 (1830); Botanical Register 27: t.62, misc. 58, no.121 (1841); Journal of the Proceedings of the Linnean Society. Botany 3: 53 (1858); J.D.Hooker, Flora of British India 5: 791 (1890); C.B.Grant, Orchids of Burma (including Andaman Islands) : 136 (1895); King & Pantling, Annals of the Royal Botanic Garden Calcutta 8: 118, t.161 (1898); Duthie, Annals of the Royal Botanic Garden Calcutta 9: 110 (1906); Kraenzlin, in Engler (ed.), Das Pflanzenrich IV-50 (2): 110 (1911); M.L.Banerji, Orchids of Nepal : 68 (1978). Eria convallarioides var. major J.Lindley, Botanical Register 33: t.63 (1847). Description Epiphytic herbs, up to 39 cm high. Rhizomes condensed. Roots in cluster from the base of pseudobulbs, strongly wiry. Pseudobulbs closely stacked together, highly variable, 3-14 × 1-2.5 cm, narrow at base, somewhat clavate above, bilaterally compressed, with 3-5 internodes; internodes sometimes spindle-shaped, wrinkled or shallowly grooved on maturity; matured pseudobulbs devoid of sheaths at upper nodes, but basal internodes are covered with imbricate-distichous sheaths; new shoots develop at the base of matured pseudobulbs, cylindrical, at base covered with imbricate 82 Richardiana XIII – novembre 2012 Distribution of Eria spicata – Agrawala & Lal sheaths, apical portion covered by the sheathing leaf-bases; sheaths ovate, entire, obtuse, 1-1.5 cm long; uppermost sheath is largest and non overlapping, and develops into a small leafy lamina. Leaves 3-7, highly variable, usually 5-17 × 1-2.7 cm, lowermost leaf is smallest, (in larger specimens leaves are up to 25 × 4.5 cm), sub-apical, narrowly elliptic- lanceolate to broadly elliptic-ovate, entire, acuminate, 9-11 veined, sessile or sometimes with narrow, channeled petiole, base sheathing. Racemes 1-3, up to 8 cm long, sub-apical, from the axil of the leaves, erect to arcuate, globose to ovate-cylindrical; peduncles 1.5-2 cm long, terete, erect, slightly curved at the apex, pubescent, at base covered with 2-3 ovate, membranous, imbricate sheaths, no sterile bract or sheath above; rachis longer, strongly arched horizontally, sometimes drooping, pubescent, densely many flowered. Floral bracts 4-9 × 2-4.5 mm, creamy yellow, strongly reflexed, ovate to ovate-lanceolate, entire, acuminate, 1-veined, sparsely pubescent outside. Flowers not fully opening, 7-12 mm long, 3.5-6 mm wide, creamy-white with yellow or pink-purple tinge at the apex of sepals and petals; mid-lobe of lip yellow; side-lobes white with purple tinge towards the apex; column apex and anther dark-purple. Pedicel and ovary 3-5 mm long, creamy-yellow, pubescent, ovary with prominent purple veins. Sepals ovate, entire, sub-acute to obtuse, 5-veined, sparsely pubescent at dorsal surface; dorsal sepal 4-5.5 × 2.5-3 mm, concave; lateral sepals 5-6 mm long, 4.5-5 mm broad at base, broadly-ovate, falcate, connate with the column-foot to form a broadly orbicular, rounded, shallowly emarginate mentum. Petals 3.5-5 × 1.5-2 mm, ovate-elliptic, slightly falcate, entire, sub-acute, 3-veined, glabrous. Lip 4-5 mm long, 4-5 mm broad through the side-lobes, fan-shaped, continuous with the column-foot without any separating line between them, 3-lobed; side-lobes ovate- falcate, rounded, much larger than mid-lobe; mid-lobe broader than long, quadrate, densely glandular-pubescent throughout, obtuse to truncate, mucronate to shortly apiculate. Column 1-2 mm long, erect, narrowly winged, white at base, dark-purple above; foot elongated, U-curved along with the base of lip, sparsely pubescent below; clinandrium cordate, with stelidia-like projections, deeply 2-grooved; rostellum beak-like, projecting forward; anther rounded, ca 0.5 × 1 mm, 2-lobed, each lobe 4-chambered; XIII – novembre 2012 Richardiana 83 Distribution of Eria spicata – Agrawala & Lal pollinia 8, in 2 groups of 4, ca 0.5 mm long, yellow, clavate, united by their caudicles; stigmatic cavity obtriangular. Capsules 0.6-1.2 cm long, elliptic- oblong, almost sessile, 6-ridged. (Plate 1). Flowering: July - September. Fruiting: October – December. Distribution and ecology Ecology & habitat: epiphytic on tree trunks in tropical valleys and subtropical primary forests between 300-2800 m. Host plants: Alnus nepalensis D.Don, Duabanga grandiflora (A.P. de Candolle) W.G.Walpers, Quercus incana Bartram, Quercus serrata Murray, Toona ciliata M.J.Roemer, Engalhardtia sp., Euphorbia royleana P.E.Boissier etc. Distribution: INDIA: Himachal Pradesh, Uttarakhand, West Bengal, Sikkim, Assam, Arunachal Pradesh, Nagaland, Mizoram, Manipur, Meghalaya; NEPAL; BHUTAN; MYANMAR; CHINA; THAILAND. Specimen examined: Himachal Pradesh: Kinnaur district, Neugalsari, 25.07.2012, Krishan Lal 1728 (BSHC). Uttarakhand: Tehri district, Agrakhal, near Narendra Nagar, 1600m., 26.03.2007 (flowered on 25.07.2008), D. K. Agrawala 40107 (BSD). West Bengal: Darjeeling district, Lolleygaon, 28.04.2004, D. K. Agrawala 32672 (CAL); Neora Valley N. P., 22.07.2004, D. K. Agrawala 32683 (CAL). Sikkim: South district, Temi – Damthang (along the foot track), 1800m., 04.03.2005, D. K. Agrawala 32698 (CAL). Assam: North Lakhimpur district, Kokoi Reserve Forests, 22.11.1957, G.